IgA class anti-beta2-glycoprotein I in patients with systemic lupus erythematosus.
OBJECTIVE
To search for a possible relationship between the presence of IgA class anti-beta2-glycoprotein I antibody (abeta2-GPI) and clinical manifestations, including thrombotic episodes, in patients with systemic lupus erythematosus (SLE).


METHODS
Serum IgA abeta2-GPI levels in 124 Japanese patients with SLE were measured using a phospholipid independent enzyme immunoassay. Relationships to clinical histories and to various laboratory data including IgG and IgM class abeta2-GPI were examined.


RESULTS
Twenty-five percent of patients with SLE were positive for IgA abeta2-GPI. Patients with a history of thrombosis had significantly higher probabilities for positivity of IgA abeta2-GPI, compared to those without. The presence of IgA abeta2-GPI was correlated with presence of lupus anticoagulant and/or biological false positive result for serological syphilis test. Titer of IgA abeta2-GPI significantly correlated with values of IgG abeta2-GPI, IgM abeta2-GPI, and anti-DNA antibodies.


CONCLUSIONS
The presence of IgA abeta2-GPI may be related to the occurrence of thrombosis in patients with SLE. Measurements of IgA abeta2-GPI may be of value for evaluating risk of thrombosis in patients with SLE.
Tsutsumi
A
A
Department of Medicine II, Hokkaido University School of Medicine, Sapporo, Japan.
Matsuura
E
E
Ichikawa
K
K
Fujisaku
A
A
Mukai
M
M
Koike
T
T
D017153:Antibodies, Anticardiolipin / Q000097:blood; D015415:Biomarkers / Q000097:blood; D006023:Glycoproteins / Q000276:immunology* / Q000378:metabolism; D006801:Humans; D007070:Immunoglobulin A / Q000097:blood*; D007074:Immunoglobulin G / Q000097:blood; D007075:Immunoglobulin M / Q000097:blood; D008180:Lupus Erythematosus, Systemic / Q000097:blood / Q000276:immunology*; D012016:Reference Values; D053482:beta 2-Glycoprotein I
D017153:Antibodies, Anticardiolipin; D015415:Biomarkers; D006023:Glycoproteins; D007070:Immunoglobulin A; D007074:Immunoglobulin G; D007075:Immunoglobulin M; D053482:beta 2-Glycoprotein I